Can I prevent Apptoto from calling certain phone numbers?

Yes, besides including [SKIP] or #skip in your calendar entries, you can also request that certain phone numbers not be called. This is useful if your calendar entries sometimes include email signatures. If you need to have a phone number blacklisted you can do so by adding that number to the "Phone Blacklist" field on the “Settings”>"Extraction Blacklists" tab of your account.